Hand-hole closure.



888,255. PATENTED MAY 19, 1908.

H. G. OSBORNE.

HAND HOLE CLOSURE.

APPLICATION FILED FEB.11,1908.

A TTbH/VE rs To all whom it may concern:

HENRY G. OSBORNE, OF PITTSBURG, PENNSYLVANIA.

HAND-HOLE onostmn.

Specification of Letters Patent.

Patented'May 19,1908.

Application filed Febi'uary 11, 1908. Serial No. 416,303.

Be it known that I, HENRY G. OSBORNE, a citizen of the United States, and a resident of Pittsbur in the county of Allegheny and State of Tennsylvania, haveinvented a new and Improved Hand-Hole Closure, of which the following is a full, clear, and exact descri tion.

e invention relates to boilers, and its obect is to provide a new and improved hand ole closure, arranged to form an exceedingly tight joint to prevent leakage of water or steam, to allow convenient removal whenever desired for gaining access to the tube to be cleaned, and to prevent displacement of the closure by the pressure of steam.

The invention consists of novel features and parts and combinations of the same, which will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a sectional side elevation of the improvement as applied; Fi 2 is an inner face view of the same, and 3 is ,a transverse section of the inner or clamping late.

The hand hole closure as shown in 1, serves to close the hand hole A in the boiler plate A opposite the tube B, and the said closure consists essentially of an inner or a clamping plate C, an outer or a covering plate D, and a bolt E centrally connecting the closure plates 0 and D with each other.

The outer or covering plate D is provided on its inner face with an annular flange D,

fitting the wall of the hand hole A, the said flange D bein spaced from the margin of the late D, thus leaving an annular shoulder or ange D which rests on a gasket F, held on the outer face of the boiler plate A. The nut E of the bolt E, screws a ainst the outer face of the covering plate to press the shoulder D thereof in firm contact with the asket F, thus roducing a very tight joint etween the bOl er plate A and the covering plate D.

The inner or clam ing late 0 is 111 dish form, having an annu ar 0 set C, fitting the wall of the hand hole A, and this offset is spaced from the margin of the plate C, thus leaving an annular flan e or shoulder G which rests on a gasket held on the inner face of the boiler plate A. Now when the nut E is screwed up, the inner or clampinag 2 plate C is thrown outwardly and its flange presses the gasket G, thus forming a tight 0111t between the clamping late 0 and the oiler plate A. The oiiset J of the inner of clamping plate 0 is provided with lugs C extendin on o posite sides of the head E of the b0 t E, t us holding the bolt E against turning when its nut E is screwed u or unscrewed, as will be readily understoo by reference to Fig. 2. i

From the foregoing it will be seen that b the use of the closure shown and described: the hand hole A is securely closed to prevent leakage, and the plates 0 and D are not liable to be displaced by pressure of steam, as the flange D and the offset 0 prevent lateral movement of the plates.

The hand hole closure is very sim 1e and durable in construction, can be red ily a plied and manufactured at a comparatively ow cost.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. A hand hole closure, comprising an inner plate, an outer plate, and a bolt or connecting the plates with each other, the outer plate aving on its inner face an annular ange fitting within the hand hole, the flange being spaced from the margin of the outer plate to form an annular shoulder engaging ,the outer face of the boiler plate, the inner plate being dished to form an off-set for engagement with the inner wall of the hand 10 e, and an annular shoulder for on agement with the face of the boiler, the dished portion having integral outwardly extending off-sets on opposite sides of its center to form retainin lu s for engagement with the bolt head to hold the bolt against turning.

2. A hand hole closure, comprising an inner plate, an outer plate, and a bolt or connlectin the plates with each other, the outer ate aving on its inner face an annular ange fitting within the hand hole, the flange being spaced, from the margin of the outer In testimony whereof I have signed my late to form an annular shoulder for engagname to this specification in the presence of mg the outer face of the boiler plate, the intwo subscribing Witnesses.

ner plate being dished to form an off-set for HENRY G. OSBORNE. 5 en agement with the inner Wall of the hand Witnesses:

ho e, and an annular shoulder for engage- MELVILLE T. OSBORNE,

ment With the face of the boiler. E. J. OSBORNE. 

